org.apache.beam.sdk.extensions.sql.impl

Class LazyAggregateCombineFn<InputT,AccumT,OutputT>

java.lang.Object

org.apache.beam.sdk.transforms.Combine.CombineFn<InputT,AccumT,OutputT>

org.apache.beam.sdk.extensions.sql.impl.LazyAggregateCombineFn<InputT,AccumT,OutputT>

All Implemented Interfaces:

java.io.Serializable, org.apache.beam.sdk.transforms.CombineFnBase.GlobalCombineFn<InputT,AccumT,OutputT>, org.apache.beam.sdk.transforms.display.HasDisplayData

public class LazyAggregateCombineFn<InputT,AccumT,OutputT>
extends org.apache.beam.sdk.transforms.Combine.CombineFn<InputT,AccumT,OutputT>

Combine.CombineFn that wraps an AggregateFn. The AggregateFn is lazily instantiated so it doesn't have to be serialized/deserialized.

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
LazyAggregateCombineFn(java.util.List<java.lang.String> functionPath, java.lang.String jarPath)

Method Summary

Modifier and Type	Method and Description
AccumT	addInput(AccumT mutableAccumulator, InputT input)
AccumT	createAccumulator()
OutputT	extractOutput(AccumT accumulator)
java.lang.reflect.TypeVariable<?>	getAccumTVariable()
org.apache.beam.sdk.coders.Coder<AccumT>	getAccumulatorCoder(org.apache.beam.sdk.coders.CoderRegistry registry, org.apache.beam.sdk.coders.Coder<InputT> inputCoder)
UdafImpl	getUdafImpl()
AccumT	mergeAccumulators(java.lang.Iterable<AccumT> accumulators)
java.lang.String	toString()

Methods inherited from class org.apache.beam.sdk.transforms.Combine.CombineFn

apply, compact, defaultValue, getInputType, getOutputType

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

LazyAggregateCombineFn

public LazyAggregateCombineFn(java.util.List<java.lang.String> functionPath,
                              java.lang.String jarPath)

Method Detail

createAccumulator

public AccumT createAccumulator()

Specified by:

createAccumulator in class org.apache.beam.sdk.transforms.Combine.CombineFn<InputT,AccumT,OutputT>

addInput

public AccumT addInput(AccumT mutableAccumulator,
                       InputT input)

Specified by:

addInput in class org.apache.beam.sdk.transforms.Combine.CombineFn<InputT,AccumT,OutputT>

mergeAccumulators

public AccumT mergeAccumulators(java.lang.Iterable<AccumT> accumulators)

Specified by:

mergeAccumulators in class org.apache.beam.sdk.transforms.Combine.CombineFn<InputT,AccumT,OutputT>

extractOutput

public OutputT extractOutput(AccumT accumulator)

Specified by:

extractOutput in class org.apache.beam.sdk.transforms.Combine.CombineFn<InputT,AccumT,OutputT>

getAccumulatorCoder

public org.apache.beam.sdk.coders.Coder<AccumT> getAccumulatorCoder(org.apache.beam.sdk.coders.CoderRegistry registry,
                                                                    org.apache.beam.sdk.coders.Coder<InputT> inputCoder)
                                                             throws org.apache.beam.sdk.coders.CannotProvideCoderException

Specified by:

getAccumulatorCoder in interface org.apache.beam.sdk.transforms.CombineFnBase.GlobalCombineFn<InputT,AccumT,OutputT>

Throws:

org.apache.beam.sdk.coders.CannotProvideCoderException

getAccumTVariable

public java.lang.reflect.TypeVariable<?> getAccumTVariable()

Overrides:

getAccumTVariable in class org.apache.beam.sdk.transforms.Combine.CombineFn<InputT,AccumT,OutputT>

getUdafImpl

public UdafImpl getUdafImpl()

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object